Legit question about appropriate behavior...

I have a distant cousin who was breast fed until he was 8 yrs old.The guy's in his 30's now & seems pretty normal by all accounts.It was just weird & awkward at family gatherings seeing this kid just go up to his mom, sit on her lap & grope for a titty to put in his mouth.

Also had a friend who would get drunk with his father & end up at brothels together.The father would always insist in sharing the same room together.